Rebound-check.



M. C. KRARUP.

REBOUND CHECK.

APPLICATION FILED JAN. 29| 914. Y i l ,258,92 1 Patented Mar. o, 1918.

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/ml/f/vm AHORA/HS M. C. KRABUP.

REBOUND CHECK.

APPLICATION msn 1m29. 1914.

MARI'US C. KBARUP, OF NEW YORK, N. Y.

REBOUND-CHECK.

ressent.

Specification of Letters Patent. i

Patented Man@ MMS.

Application filed January 29, 1914. Serial No. 815,105.

To all whom t may concern.' N

Be it known that L MARIUS KRARUP, a citizculof the United States of America, and a resident of New York, county and State of New York7 have invented certain new and useful Improvements in Rebound-Checks, of which the following is a specification, reference being had to the accompanying drawings, forming a part thereof.

My invention relates to improvements in rebound checks such as are employed in combination with springs, as, for example, such as are used as shock-absorbers in combination with the springs of a vehicle, and its object is to provide va simple and eiiicient device which will not interfere with the desired action of the springs, but which will effectively prevent undesirable rebound actions.

rIhis and other objects of this invention` will appear in the following specification in which l will describe various mechanisms which embody the invention, the novel eatures ort which I will set forth in the appended claims.

Referring to the drawings:

Figure 1 is a side elevation of a portion of the frame oit a vehicle, its axle which is shown in cross-section, an interposed spring, and a device which embodies the present invention connected with the vehicle frame and the axle. l

Fig. 2 is a sectional side elevation of the rcbgund check device of Fig. 1 drawn on a larger scale, and Fig. 3 is a sectional plan view of the same device. The section of Fig.

Q is taken on the line 2 2 of Fig. 3, and the*- section ot' Fig. 3 is taken on the line 3 3 of Fi g. 2.

Fig. 4 is a side elevation of another mechanism with its cover removed, which mechanism is also made according to this invention.

In Figr another modification of structure which embodies my invention is shown in side elevation. The cover of this device is also removed so that its parts may be more readily seen.

Fi 6 is an end view of a art of a vehicle i showing a portionloi its axle, `a part of the vehicle frame in section with a rebound check which embodies my invention shown in sectional elevation.

Fig. 7 is an inverted sectional plan View of the device shown in Fig.` 6, the section being taken on the line f-7 of Fig. 6 looking in the direction of the arrows.

v8 8, and the section in Fig. 9v being taken on the line 9 9, both of F ig. G and'in each case .looking in the direction ci the arrows applied to these respective lines.

Like characters of reference designate corresponding parts in all the igures.

10 designates the frame of a vehicle and 11 one ofits axles. Between these two parts is a spring 12 which is connected .in some suitable manner with both of them.

The device shown in Figs. l,l 2 and 3; Acomprises a circular casing the base of which is designated by 20. From this base'nearits periphery extends an annulartlangeQl and a shorter inner flange 22'. Fitted between the flanges is a vane 23 from which extends a ring 24 which fits loosely around the'inner flange 22. The corner of this vane isv cut away to provide an opening 25 or, if desired, a hole 25a may bc drilled through it and it is adapted to rest by gravity against a stop piece 26 which is atlixed to the iange 21 upon its inner surface. The relation of this stop piece to the flange upon which it is mounted is resilient as by a springy sup` port, so as to moderate the abruptness of the check.

'Within the casing is an oscillatory member 30 the hub of which comprises an inner portion 31 which tits both within and without the iiange 22, and an outer portion 32 which projects outside of the casing and to which an arm 33 is rigidly aiixed and held in place by a bolt 34. The member 30- is constructed to form a vane 35. 3G is a cover which completes the casing. This cover.` tits over the iiange 21 and is provided with a central opening through which a circular part of the hub 32 projects. Between the cover and the member -30 are packing rings 37. The cover has a rim flange 38 and bolts or screw'sri) fasten it and the casing base 2O together. Some of these bolts pass into the vehicle frame and serve to aliX the relatively stationary casing of the device to the vehicle frame. v

The outer end of the arm 33 is connected with the axle 11 by somesuitable mechanism such for example as by a right and left hand threaded rod 13, the lower end of which screws into a shackle 14 which is atxed'to the axle by a ball and socket device, and-the upper end of which screws inte aisoclret 15' which receives and holds an enlarged head on the end of the arm 3l. Such a connection affords ready means for adjusting the distance between the axle and the outer end of the arm Sil.

Before describing in detail the mechanisms shown in the other figures of the drawings, will point out the operation or" the ldevice shown in these first three figures.

lVithin the casing is an annular space which is preferably filled 'ith oil. This space is divided into two chambers by the vanes 23 and 3.3. ille *.vill assume that the load on the vehicle has compressed the spring 12 to the degree shown and that the parts are so adjusted that they assume the relative positions in which they are shown inA Figs. 'l and 2. Any shock or jar which will Jrurther compress the spring Will torce the cnd of arm upward and in so doing Will move the vane through an arc to the right. This will impart a circular movement to the fluid which will move the vane 23 through an are almost as great as the. arc of movement of the vane 35.

NOW it may be seen that when the shock 0r jar which has been cushioned or taken up hy the compression of the spring, has eeen removed, the spring-is perfectly tree to return to its initial or load sustaining position for thc reason that there is nothing to prevent the Yanes 35 and 23 from moving hack to the positions from which they start-- ed. t may be seen also that any tendency which the spring may have of itself or aided oy external intiucnces to rebound pass below the point troni which it started, Will be checked or retarded because at or slightly before rebounding Would begin the vane has reached its starting point, the stop 25. As it can more no farther except against a strong spring resistance if the stop resilient, it arrests the free circulation ot oil and therefore etiectivelyv checks and retards further movement of the vane to the left and of the arm 33 in a downward direction. The amount of this rctarding eii'cct is of course dependent upon the lit of the parts, the size of the hole 25, and the consistency ot' the oil. all factors which can 'ne changed to suit existing conditions.

The spring may 'return therefore quickly to its load bearing position Where it is ready at once to cushion another shock. it to he noted that slow changes oi pressure such as changes in the load on the vehicle will not. affect the operation of the device as the vane 23, returns when not under pressure froni rapid movements oi" the i'iuid Yby gravity to its rest position, the opening Q5 allowing for the circulation ot' the fluid at a limited rate.. This opening may he in the vane 35, i lerred. The shape and dimensions o opening are so arranged that the reta eilect ivill'hegin at a point slightly before insegni tor effecting' the return movement of the vane Above the casing is an ope:i ine by which it may he lillcd with oil and certain amount et air space is lett in it will have a cushioning effect.

ln the structure illustrated in '-i, tie casing t0 is ot a ditierent shape. "ihe arn Si is pivoted el and so connected ivith the vehicle shaft and the vehicle traine as s to more a vane @L2 to the right when the rchicle spring is compressed. rthis vane swings over a concentricV surface i3 and draivs oil or other Huid out of a chamber se through a channel l5 into a chamber -il-S. 8 in the chamber ist is a curved snifaze over which moves the end ot' a. treeay pivoted vane 48 which is provided with an orifice 9. This 'rane in its initial position -este hy gravity against an abutment 50 termed in se the casing. The edges ot the vanos l@ and. #i8 as in the other structure t loosely against the casing and its cover.

rthe operation ot' this device is similar to that of the other arrangement 'which has 9 been described fully, 'out this structure has the advantage ot simplicityT of forni and construction and of small vertical diniensions for a given power ot" action. idrovision is made for lling the device with oil through an opening into an upper chainher from which it runs down ii other chambers through channels designates the casing the r ment shown in Fig. 5. in this ca 3l@ is raised when the vehicle spring pressed. This arm is connected at Si a rotary pivot to which is also connes. Within the casing an arm 62. G3 is a r: which is pivoted at 6i and is connected a link with the arm 62. rthis is arranged to swing over a concentric surface GG.

Il n the casing is a curved portion t3? over ivhieh sv-:ings a pivoted vane 68 which, as in the other cases, provided Withan orifice 59, and is arranged to rest upon an abutment which checks its movement'. in one direction.

rhe operation of this device is similar to that of the others which have heen r escrioed and this structure has the advantage oit haifing the pivot 6l which passes through this, casing above the pivots oi` the-varies and outside of the pressure chamber.

The remaining gures of the drauf'ings illustrate a simple and possibly'- preferreil structure. in these figures, 7G designates a cylindrical dash-pot in which a dinally movable piston 7l. rhis mounted on the lower end of a hello rihe desli-pot cjviinder is connecten hy national means of a yoke 73 with the frame 10 of the vehicle. The hollow rod 72 is connected by a bracket 74C with the axle 11 ot the vehicle.

Below the. piston 71 is an auxiliary piston 7 5 which is atlixed to a slotted stem 7 o' which tits loosely within the lower end of the hollow rod 72.

This structure is lilled with oil or other fluid and its operation is as follows: When the vehicle springs are compressed to move the axle il toward the trame l0, the piston 71 will be raised thereby, causing the oil or other iuid to be forced out through ports 77 near the upper part of the structure, down through channels 78, and through ports 79 into the lower part ot' the structure. The suction caused by the upward movement of the piston and also the circulation of 0'11 into the lower part of the cylin- .der below the auxiliary piston 75, will cause the latter to follow up after the piston 71. Since however, as the spring causes the axle to travel away from the vehicle frame again, the two pistons 7l and 75 will move downward freely without retarding the action of the spring until the auxiliary piston 71 reaches the lower end of its travel and rests upon the head of the cylinder. rlhis will then stop further circulation of the iiuid through the channels or passages 78 so that after the piston 71 has reached its initial position, its further downward movement will be checked and retarded by the fluid which`is between it Aand the piston 75. The piston 71 is provided with a pair of openin gs, the size and arrangement of which will,

adjust the amount of retarding eect.

The result ot this will be obviously that the spring will be allowed to resume its initial position but any tendency of it to rebound beyond its initial position will be ,pheeked The oil openings through the piston and the means for adjusting their relative positions are shown in Figs. 6, 8 and 9; In the piston are two diametrically opposed openings SO and a plurality of threaded holes 81, the latter being arranged on the common are of a circle. Adjustably alixed tothe bottom of the piston is a disk- 82 in the edge of which are oppositely disposed openings 83 and through which are two screw holes 84. By this arrangement the disk 82 may be attached to the bottom of the piston 71 in such a position that the openings 83 are in alinemcnt with the holes 80, or are ninety degrees out of alinement or are in intermediate positions. By this means the path of flow of the oil may be direct or may be made more or less tortuous to thereby adjust the resistance to its flow and its retarding effect. 85-86 are two disks which carry between them a' packing and which surround the hollow rod 72. A eompremion spring 87 1s interposed between these disks and the top of the piston 7l. This arrangement is such that if an eX- treme upward movement is imparted to the piston the disks 86 will strike against the top 88 of the cylinder and the shock will be taken up by the spring 87. When such an extreme movement does occur the upwardly extending annular tlange of the piston will cover the ports 77 so that the oil entrapped above the piston will also serve to take up this shock. l have illustrated and described several different structures which embody this invention, for the purpose of showing that it is not limited to any particular construction or arrangement of parts. 1n fact, l intend that only such limitations be imposed as are indicated in the claims.

What l claim is:

l. A rebound check comprising a fluidcontaining casing, a positively actuated member, a detached movable member in said casing, and a stop for restraining the detached member against movement in one directionfrom a predetermined initial position, said detached movable member being arranged to move from and back to its initial position with corresponding movements of the positively actuated member and to engage th'e stop and retard further movement of the positively actuated member in the direction of its return movement.

2. A rebound check comprising a fluidcontaining casing, a positively actuated movable member in said casing, a detached movable member constituting a partial barrier and arranged to be freely moved from and to an initial position by said positively actu- .ated member through the tendency of said fluid, and means for limiting the return movement of said detached movable member to cause the tluid to check further movement of the positively actuated member in a like direction. 1

3. A rebound check comprising a Huidcontaining casing having an endless fluid passage,a positively actuated movable member in said passage, a detached movable member also in the passage. means'for moving said positively actuated member in opposite directions to circulate the fluid to thereby cause the freely movable member to move from and back to its initial position with corresponding movements of the positively actuated member, and means' for stopping the return movement of the freely movable member at its initial position, to check the circulation of the fluid to thereby check further movement ot the positively actuated member in a like direction.

d. A rebound check comprising a fluid containing cylinder, a piston therein, a by-pass around the piston, and a freely movable device arranged to move from and back to its initial position with corresponding moveappended mim the i in iis l0 sin del 4 d' manifs *msnm pon( le. A. rebound check for a vehicle having` an axle and a body resiliently supported thereby, said check comprising a fluid containing casing secured to the body, a piston freely movable from and back to a fixed initial position within said casing, another piston within said casing arranged to Ibe actuated by relative movements between said body and axle and to impart movement to said freely movable piston through the intermediation of the fluid Within the casing, and means for ,checking a return movement of said freely movable piston beyond its initial position.

15. 4A rebound check for a vehicle having wheel axle and a body resiliently supported thereon, said check comprising a fluid containing casing' secured tO the body, a piston freely movable from and back to a fixed initial position Within said casing, another piston Within said casing adapted to be moved from and back'to a variable initial position, dependent upon the static load on the body, by relative movements between the body and axle, and to impart movement to said freely movable piston through the intermediation of tl'ie Huid within the casing, and means for checking a return movement of said ireely movable piston .beyond its initial position.

16. A rebound check for spring-mounted 17. A rebound check for spring-mounted vehicle bodies coinprising a Huid-containin'g casing having' an endless iiuld passage, a piston therein positively actuated by relative movements between the body and axlev of the vehicle and adapted to occupy a variable initial position dependent upon the vehicle load, and a detached piston in the passage movable in both directions With saidv positively actuated piston adapted to occupy a fixed initial position and constituting a partial barrier for' retarding the movement of Huid in the passage in one direction.

In witness whereof, I have hereunto set my hand'this 22 day of January, 1914, in the presence of two subscribing Witnesses.

MARIUS C. KRARUP. Witnesses:

F. GRAVES, LEONARD HAUERSTEIN. 

